JPH1018201A - Electric switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the waterproof function and prevent the loss of conversion force, by providing waterproof bellows so as to cover a part of a projection protruded outward from the easing of a movable rod movable in/from the casing. SOLUTION: Bellows 4a, 4b made of a waterproof material are provided so as to cover a part of a movable rod 2 protruded outward from the casing 1 of an electric switching device (a). One end side of the bellows 4a is fixed to a step 1a provided at the periphery of the projection of the movable rod 2 through a band member 6a. And the other end side of the bellows 4a is fixed to the movable rod 2 through a band member 6b. The dimensions of the bellows 4a are decided so as to have a sufficient space in which the movable rod 2 can be inserted and a sufficient length for the transfer distance of the movable rod. In this way, since the movable rod is covered with the bellows 4a, 4b in the distance from the easing 1, the waterproof function is improved and as sliding seal members conventionally used are not provided, the loss of conversion force is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric point machine, and more particularly to an electric point machine with improved waterproof performance.

[0002]

2. Description of the Related Art Conventionally, an electric switch of this type for operating a tongue rail is operated by a motor as a drive source, to enter and exit a casing of the electric switch, and to lock the operation can. Has a can. In addition, an electro-pneumatic switch using compressed air as a driving source is also used, but this electro-pneumatic switch also has an operating can and a lock can enter and exit from the casing, similarly to the electric pen. Thus, in the present invention, this electropneumatic switch is also included in the electric switch.

[0003] Since electric switches are usually used in places exposed to rain, in order to prevent rainwater from entering the casing, an O-switch is provided between the casing and the operating can and between the casing and the lock can. A seal member such as a ring is provided.

[0004]

However, in order to prevent rainwater from entering, the above-mentioned conventional electric points are provided with a sealing member such as an O-ring. In order to enhance the watertight effect between the lock and the can, since it is in contact with a predetermined pressure, it is liable to wear due to sliding movement of the operating can and lock can, and the seal member is worn. At times, it has been troublesome to open the casing and replace the seal member.

[0005] Further, since the operating can and the locking can are slid with the seal member while maintaining the pressure as described above, there is a sliding resistance, and there is a drawback that this resistance causes a loss of conversion force. .

Accordingly, the present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide a waterproof function which has a high waterproof effect, can be easily replaced, and has no sliding resistance. An object of the present invention is to provide an electric point machine.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, an electric switch according to the present invention is provided such that an operating can or a locking can provided to be able to enter and exit from a casing projects out of the casing. A waterproof bellows is provided so as to cover a part of the bellows, one end of the bellows is fixed to the casing in a watertight manner, and the other end is fixed to the operating can or lock can in a watertight manner. It is characterized by having.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an electric switch a according to one embodiment.

The electric pointing machine a has a motor M as a drive source at one end (the upper end in FIG. 1) of the casing 1. Although not shown, in the casing 1, the operation of a reduction gear mechanism for reducing the number of revolutions of the motor M, a conversion gear having rollers, an escape surface operated by the rollers, etc., as in a well-known electric pointing machine. A drive mechanism for operating the can 2 in the illustrated arrow direction and a lock mechanism for locking the operation can 2 with the lock can 3 that moves in the illustrated arrow direction are provided.

In the figure, reference numerals 4a and 4b denote bellows made of a waterproof material such as synthetic rubber provided so as to cover a part of the operation can 2 projecting out of the casing 1, respectively. The bellows are made of the same material as the bellows 4a and 4b provided so as to cover a part of the lock can 3 projecting out of the casing 1 respectively.

Since the bellows 4a and 4b and the bellows 5a and 5b have the same mechanism, the bellows 4a and the bellows 5a are sectional views taken along the line AA in FIG. 1 and FIG.
This will be described with reference to FIG. 3 which is an enlarged sectional view taken along the line B.

The bellows 4a is provided at a root portion where the operation can 2 projects outward from the casing 1. That is, one end side (the casing 1 side) of the bellows 4a is fixed to the step portion 1a provided around the projecting portion of the operation can 2 via the band member 6a. The other end of the bellows 4a is fixed to the operation can 2 via a band member 6b.

The size of the bellows 4a has a sufficient space into which the operation can 2 can be inserted.
It is determined so that it can cope with the amount of movement.

The bellows 5a is provided at the base where the lock can 3 projects outward from the casing 1. That is, one end side (the casing 1 side) of the bellows 5a is fixed to the step portion 1b provided around the projecting portion of the lock can 3 via the band member 7a. The other end of the bellows 5a is fixed to the lock can 3 via a band member 7b.

The size of the bellows 5a has a sufficient space into which the lock can 3 can be inserted.
It is determined so that it can cope with the amount of movement.

In the electric switch a having the above construction, the operating can 2 and the lock can 3 are provided between the casing 1 and the bellows 4.
Since they are covered with the bellows a and 4b and the bellows 5a and 5b, respectively, they are excellent in waterproofness and can be easily replaced. In addition, since there is no sliding seal member as in the related art, loss of the conversion force can be prevented.

Although the above-mentioned electric switch has a lock can, the applicant of the present invention disclosed in Japanese Patent Laid-Open No. Hei 5-27861.
When the lock mechanism proposed in Japanese Patent Publication No. 0, 278611 or the like is incorporated in the casing, and the lock canister does not protrude from the casing, the bellows are provided only in the operation can.

[0018]

The electric switch according to the present invention is waterproof so that it covers a part of the operating can or lock can provided to be able to enter and exit from the casing and protruding from the casing. The bellows is characterized in that one end of the bellows is fixed to the casing in a water-tight manner and the other end is fixed to the operating can or lock can in a water-tight manner, so that it has excellent waterproofness. In addition, since it can be easily replaced and does not have a sliding seal member as in the related art, loss of conversion force can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of an electric pointing machine according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Operation can 3 Lock can 4a, 4b, 5a, 5b Bellows 6a, 6b, 7a, 7b Band member

Claims (1)

[Claims] 1. A waterproof bellows is provided so as to cover a part of a portion of an operating can or lock can provided to be able to enter and exit from a casing and protruding from the casing,
One end of the bellows is fixed to the casing in a watertight manner, and the other end is fixed to the operating can or lock can in a watertight manner.